I was told today by a hematologist that the topiramate that I took for 8 years to prevent migraines has harmed my immune system. I have low IgGs, as well as IgAs. I was also told that it could take anywhere from 1 year to 5 years after I stop taking the medication for my immune system to return to normal.

I would appreciate to hear from people who have encountered this bizarre side effect of topiramate.

Thanks for writing this. I think it can affect people in very many different ways. It doesn't make sense to me. I really had to dig to get information about how it affects the immune system. And the only side effect I was told when I was given this drug by a neurologist was that it might affect my memory.

Liseanne13- I assume this is Topomax? If so it worked well to decrease my migraines from daily down to maybe 2-3 times a week but then after maybe 1 year on the drug it started to really impact my memory. I noticed it was hard to remember pin numbers and small things so I reduced the dose then went off the drug. Now my memory is better, but not like it used to be. I wish I never took the drug.

I'm Canadian - I don't know if I have any legal recourse. Thank you for mentioning that, I will look into it. Yes, I also had awful memory problems with topamax. It worked incredibly well for me for almost four years - I had a normal life. Now I'm trying Botox.

I have been on Topamax for a year. My memory is terrible, I am dizzy all the time, I still have migraines 5-6 days a week but I have lost 40 lbs and I love that side effect. I haven’t had my blood checked yet. Did anyone lose weight on Topamax and then gain it back when you went off? Botox was amazing for my migraines. About two weeks after my first Botox injections the migraines vanished and I stayed migraine-free for almost three months. The side effects were worse than with Topamax, though. I had drop attacks (no warning fainting 1-2 times every day for three months). I was unable to drive or function due to the drop attacks and intense dizziness. I can’t do Botox again.

What really convinced me to stop taking it was "kinda" not remembering things to being unable to remember my passwords, I consider this severe. Honestly I am living without and my doctor just changed my RX to a different drug.

Nothing is worth having no memory. No I did not gain a lot of weight. I felt like it surpassed my desire to eat. No I want to eat all the time.

Botox made me have drop attacks 1-2 times a day and the dizziness was debilitating. My migraines are from a concussion and whiplash 18.5 months ago and the Botox paralyzed the muscles that are holding my vertebrae in place following ligament damage. I don’t know if Topamax helps the migraines since they are still chronic but I liked the weight loss. I don’t want permanent effects though.

Mmm this is interesting. I've been on this since the summer and never really wanted to be on it due to the side effects I heard about. I currently have bad anxiety and had bad tiredness for a month few weeks ago. Maybe that's down to the drug?

I have taken Topamax 4 over 8 years and have been diagnosed with mild cognitive impairment which will lead to dementia eventually! I feel the company should be held responsible for all of these side effects. I was taking 50 mg in the morning and 100 at night I have cut down the 50mg in the morning and trying to cut the hundred at night. So many of us have the same problems with memory! It's not fair that we traded migraines 4 dementia!!!!!

I took topiramate for 3 months, steadily increasing the dose. I lost between half a stone to a stone because it completely suppressed my appetite. It got to the point where I couldn’t keep food down - or the tablets! I’m a scientist and really struggled to do any maths on this drug. That was about 6 years ago and now my appetite is still a bit screwed up. Some weeks I could eat everything all the time and others I can forget meals. My migraines turned out to be caused by hyperflexibility pressing on the nerve leading to the trigeminal nerve. Physio has helped a lot. Topiramate was one of the worst drugs I tried.

Some side effects have been reported, and the pharmacist provided me a list of possible side effects. It does not list all of the side effects, only the ones that most people have. Some people have "unusual" side effects and I haven't been able to find all of those online yet.

Hi Lisa, it doesn’t matter if the side effects being suffered have previously been reported and listed in the drug information. All side effects being suffered should be reported then the drug manufacturers can know the incidence of side effects. It may be a side effect they have listed as rare, in reality is not so rare but just hasn’t been reported very often.

We should all get reporting the side effects to help other people know the truth about these drugs.

Hi Swensew. Yes, I agree that the side effects should be reported. I found out about the problems with the immune system by searching with Google, and it was in relation to a study done for epilepsy, not migraines.